*{margin: 0px;padding: 0px;font-size: 14px;}
ul,ol{list-style: none;}
a{text-decoration: none;}
a:hover{text-decoration: none;}
img{border: none;}

.center{
    width: 1000px; margin: 0 auto;
}

.center_first{
    width: 1000px;
    background: url(../img/letter2.png) left top no-repeat;
    height: 266px;
    margin-top: 20px;
    background-size: 100% 100%;
}
.center_first h2{
    font-size: 30px; color: white; font-weight: 400;
    line-height: 60px; text-align: center;
}
.center_first ul{
    width: 65%;
    margin: 110px auto 0;
}
.center_first ul li{
    width: 50%;
    float: left;
    cursor: pointer;
}
.center_first ul li a img{
    width: 75%; height: 100%; margin-left: 41px;
}